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I have a 2010 Toyota prius with approx. 95,000 mi. Over the…

Customer Question
I have a 2010...

I have a 2010 Toyota prius with approx. 95,000 mi. Over the past month the mpg has dropped from an ave 44-47 to mid 30's. At first I thought bad gas but after several fillups, no change.

Mechanic's Assistant: When did you last clean or replace your air filter? And are the oxygen sensors in good working order?

It was service at about 88, 000 and assume those items were checked.

Mechanic's Assistant: Are you fixing your Prius yourself? What have you tried so far?

No, I've always taken to the dealer and have maintained it on a regular basis.

Submitted: 4 months ago.Category: Toyota
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Answered in 31 minutes by:
1/17/2018
Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Toyota
Satisfied Customers: 5,351
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Toyota Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

Is there a check engine light on ?

MAF sensor ,oxygen sensor,Heater circuit for oxygen sensor, vacuum leak , all will effect the air fuel ratio

You need a live data capable scanner to read fuel trim readings ,Short Term AND long term fuel trim

Fuel Status when warmed up : is staying at Open Loop Or Changing to Closed loop where ecm takes info from Oxygen Sensors after they heated up, if we are not changing to closed loop that will be the severe fuel consumption difference

If you do not mind me asking are you looking for the most possible causes and taking it to a repair shop or you are repairing it yourself and you need step by step instructions
Please Let Me Know
Thank You
Chad Farhat
ASE Certified Technician

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